Простой JS тест

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<a class="fbtn fdl nRekl" href="https://www.google.com/" data-track-download data-prefix="https://www.google.com/">
<div class="fbtn-icon fx-col fx-center fx-middle"><span class="fa fa-download"></span></div>
<div class="fbtn-desc fx-1">
<div class="fbtn-capt nowrap">Скачать бесплатно</div>
</div>
</a>
<script src="https://code.jquery.com/jquery-3.4.1.min.js"></script>

JavaScript

$(document).on('click', '.nRekl', function (e) {
		e.preventDefault();
		var aLink = $('.nRekl').attr("data-prefix");
		window.open(aLink, '_blank');
	});